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Example code of tasoft/php-i2c-extension

Informations about the package php-i2c-extension

The PHP i2c Extension

I've created this extension to get access to the i2c bus on my raspberry pi.

Prerequisites

Installation

Change the configure file on line 5 (php-config7.4), to match your installed version of PHP. Then, run the following commands to install the extension.

Next, find the location of PHP's INI files on your computer by running the following command.

Note: If you're using Microsoft Windows, then run php --ini and look for the value of "Configuration File (php.ini) Path:".

You should see a directory path such as /etc/php/7.4/cli. In that directory, create a new INI file named 20-i2c.ini with the following contents

Then, with the file created, test that the I2C extension is loaded by running the following command:

You should see the following output:

Usage

The extension adds five function to the global scope:

  1. This opens the device bus.

  2. This selects an address of a connected chip.

  3. Reads data from the i2c bus.

  4. Writes data to the i2c bus

  5. Closes the bus.

Example

I've tested with a Raspberry Pi Model B 3+ and the Adafruit ADS1115 analog to digital converter. It's default i2c address is 0x48.

Usage PHP

The package also contains a php wrapper class for i2c.

Please note that the composer installation does not compile the extension! For compilation use the installation guide described before.

Now the same example can be rewritten as:

All versions of php-i2c-extension with dependencies

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Requires php Version >=8.0
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